If size matters to you, then you’re going to love the German Flak 36 88mm cannon.
Designed in the mid 1930s, the 88mm flak gun was used heavily by the German army throughout WWII.
The name Flak comes from the German word Flugzeugabwehrkanone which means aircraft defense cannon.
This massive gun also served as a the main gun on the Tiger I heavy tank.
See it in action in the video below.